One of these ideas would involve her gaining potent magical powers and a mission to, back home, drown all humans. So, yeah, in that case he would need his AVATAR POWERS to shield himself.

(Though I may go with something besides these two. Rewriting her Luceti memories, which involve a good number of human interactions when she comes from an human-hating AU would be so incredibly convoluted that it gives me a headache even before trying to think it out.)